Which construction material will interfere with the transmission of wireless signals?

Which construction material will interfere with the transmission of wireless signals?

• A. Wood
• B. Glass
• C. Mirrors
• D. Brick

Answer: (C)

Wireless signals pass through many common building materials, but metals and metal-coated surfaces can reflect or absorb those waves, creating dead zones. Mirrors are typically glass with a metallic coating on the back, so that metal layer acts like a shield, reflecting radio waves and preventing them from passing through. That shielding effect can interfere with Wi‑Fi, Bluetooth, or cellular signals in the area behind or around the mirror. In contrast, wood and brick are mostly non-conductive or only attenuate signals moderately, and plain glass usually lets signals through, so they’re less likely to cause the same interference.

Wireless signals pass through many common building materials, but metals and metal-coated surfaces can reflect or absorb those waves, creating dead zones. Mirrors are typically glass with a metallic coating on the back, so that metal layer acts like a shield, reflecting radio waves and preventing them from passing through. That shielding effect can interfere with Wi‑Fi, Bluetooth, or cellular signals in the area behind or around the mirror. In contrast, wood and brick are mostly non-conductive or only attenuate signals moderately, and plain glass usually lets signals through, so they’re less likely to cause the same interference.